[FORGEJO] a network of "" is not the same as "host"

The comment that introduced this change suggests it was motivated by a
border case by which the image would be empty. It is however unclear
why it should have any impact on how the network name is determined.

The hunk is reverted.

https://github.com/nektos/act/pull/1949/files#r1315163582

act/runner/run_context.go

@@ -535,13 +535,6 @@ func (rc *RunContext) startJobContainer() common.Executor {
 			return nil
 		}
 
-		jobContainerNetwork := rc.Config.ContainerNetworkMode.NetworkName()
-		if rc.containerImage(ctx) != "" {
-			jobContainerNetwork = networkName
-		} else if jobContainerNetwork == "" {
-			jobContainerNetwork = "host"
-		}
-
 		rc.JobContainer = container.NewContainer(&container.NewContainerInput{
 			Cmd:            nil,
 			Entrypoint:     []string{"tail", "-f", "/dev/null"},
@@ -552,7 +545,7 @@ func (rc *RunContext) startJobContainer() common.Executor {
 			Name:           name,
 			Env:            envList,
 			Mounts:         mounts,
-			NetworkMode:    jobContainerNetwork,
+			NetworkMode:    networkName,
 			NetworkAliases: []string{rc.Name},
 			Binds:          binds,
 			Stdout:         logWriter,